Danfoss VLT AQUA Design Manual page 69

®
VLT AQUA Drive Design Guide
3.7.8. 24 V Back-Up Option MCB 107 (Option D)
External 24 V DC Supply
An external 24 V DC supply can be installed for low-voltage supply to the control card and any option card installed. This enables full operation of the
LCP (including the parameter setting) and fieldbusses without mains supplied to the power section.
External 24 V DC supply specification:
Input voltage range
Max. input current
Average input current for the frequency converter
Max cable length
Input capacitance load
Power-up delay
The inputs are protected.
Terminal numbers:
Terminal 35: - external 24 V DC supply.
Terminal 36: + external 24 V DC supply.
Follow these steps:
1. Remove the LCP or Blind Cover
2. Remove the Terminal Cover
3. Remove the Cable Decoupling Plate and the plastic cover un-
derneath
4. Insert the 24 V DC Back-up External Supply Option in the Option
Slot
5. Mount the Cable Decoupling Plate
6. Attach the Terminal Cover and the LCP or Blind Cover.
When MCB 107, 24 V back-up option is supplying the control circuit, the
internal 24 V supply is automatically disconnected.
Illustration 3.21: Connection to 24 V back-up supplier (A2-A3).
Illustration 3.22: Connection to 24 V back-up supplier (A5-C2).
®
MG.20.N3.02 - VLT is a registered Danfoss trademark
3. VLT AQUA Selection
24 V DC ±15 % (max. 37 V in 10 s)
2.2 A
0.9 A
75 m
< 10 uF
< 0.6 s
3
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